From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rasmus <rasmus@gmx.us>
Subject: Re: [bug, org-table] new hline doesn't update formula
Date: Sun, 17 May 2015 21:06:31 +0200
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References: <87zj55wxri.fsf@gmx.us> <87y4kn6nd2.fsf@nicolasgoaziou.fr>
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Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Hello,
>
> Rasmus <rasmus@gmx.us> writes:
>
>> Consider this example:
>>
>> |---+---+---|
>> | a | b | c |
>> | d | e | f |
>> |---+---+---|
>> | 1 | 2 | 3 |
>> | 4 | 5 | 6 |
>> |---+---+---|
>> | 5 | 7 | 9 |
>> #+TBLFM: @5=vsum(@II..@III)
>>
>> Insert a hline after |a|b|c|. The formula is now broken.
>
> What should happen to the formula if hline is inserted between |1|2|3|
> and |4|5|6|?

Good question.  I'm not sure.  While not necessarily the most obvious I
think in that case the formula should be unchanged.  But it's not obvious.

>> Expected behavior: org-table-insert-hline should call
>> org-table-fix-formulas, though this does not currently support hlines, it
>> seems.
>>
>> I have no idea how trivial or hard this is to fix this...  But hints or
>> fixes are appreciated.
>
> It doesn't seem too hard to fix. I think we just need to extend
> `org-table-fix-formulas' to handle "@I" parts and call it from
> `org-table-insert-hline'.

I guess something like that.

> Anyway, actual fix depends on the answer to my initial question.

Yeah...

—Rasmus

-- 
. . . The proofs are technical in nature and provides no real understanding